Massive concrete temperature control device

Abstract

The utility model discloses a mass concrete temperature control device relates to building construction technical field. The device includes cooling water tank, cooling water pump, cooling inner tube that is radially distributed in the concrete inside, cooling outer tube, temperature measuring part, electromagnetic flow valve and PLC controller. The input of cooling inner tube is located in the concrete center area, and the output extends outward. PLC controller and temperature sensor and electromagnetic flow valve electric connection, according to the real -time monitoring concrete inside and outside temperature difference automatic regulation cooling water flow. The utility model discloses through radial layout priority reduces the temperature of central heat accumulation area, and combines PLC and realizes intelligent accurate temperature control, effectively prevents the crack of concrete because of temperature difference too big, has the even heat dissipation, high efficiency and the advantages such as high degree of automation.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and in particular to a temperature control device for large-volume concrete. Background Technology

[0002] The construction of large-volume concrete is very common in projects such as bridge foundations, raft foundations for high-rise buildings, and hydraulic dams. Due to their large cross-sections and high cement content, large-volume concrete releases a significant amount of heat during cement hydration. Because concrete has poor thermal conductivity, this internal heat is difficult to dissipate, leading to a rapid rise in internal temperature while surface heat dissipates more quickly, resulting in a large temperature difference between the inside and outside of the concrete.

[0003] When the temperature difference between the inside and outside of concrete exceeds a certain limit (usually 25℃), it generates enormous thermal stress, causing cracks to appear on the surface or inside the concrete. These cracks not only affect the appearance of the building, but more seriously, they reduce the strength, impermeability, and durability of the concrete, posing potential safety hazards to the project's quality.

[0004] Traditional control methods typically involve embedding cooling water pipes inside the concrete and manually controlling the water flow to lower the internal temperature. However, traditional methods often rely on manual timed temperature measurements and manual valve adjustments, which cannot provide real-time response and make it difficult to precisely control the temperature difference within a safe range.

[0005] Therefore, there is an urgent need for a large-volume concrete temperature control device that can automatically monitor temperature differences, accurately adjust flow rates, and has high cooling efficiency. Utility Model Content

[0006] The purpose of this invention is to provide a temperature control device for large-volume concrete to solve the problems mentioned in the background art, such as cracking caused by large temperature differences between the inside and outside of concrete, and the inaccuracy and low efficiency of traditional cooling methods.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a temperature control device for large-volume concrete, the temperature control device for large-volume concrete comprising: A cooling water tank, wherein the cooling water tank is filled with cooling water; A cooling water pump, the input end of which is connected to the cooling water tank; Multiple cooling inner pipes are radially distributed inside the concrete. The input end of the cooling inner pipe extends from the central area of ​​the concrete, and the output end extends outward from inside the concrete. The cooling outer pipe has one end connected to the output end of the cooling water pump and the other end connected to the input end of the cooling inner pipe. The temperature measuring unit includes multiple internal temperature sensors located near each of the cooling inner tubes and external temperature sensors disposed outside the concrete. Multiple electromagnetic flow valves are provided at the input end of each of the cooling inner tubes; The PLC controller is electrically connected to the internal temperature sensor, external temperature sensor, cooling water pump, and electromagnetic flow valve via wires.

[0008] In one embodiment, the cooling inner tube is a curved, corrugated pipe.

[0009] In one embodiment, the output end of the cooling inner pipe is connected to the cooling water tank.

[0010] In one embodiment, a waste heat recovery device is installed on the pipe connecting the inner cooling pipe to the cooling water tank.

[0011] In one embodiment, an audible and visual alarm is further included, which is electrically connected to the PLC controller.

[0012] In one embodiment, the cooling inner tube is fixed to a steel reinforcement skeleton inside the concrete by being tied with steel wire.

[0013] The above-described technical solutions in the embodiments of this utility model have at least the following technical effects or advantages: The large-volume concrete temperature control device provided in this embodiment uses a PLC controller combined with internal and external temperature sensors to monitor the temperature difference between the inner and outer surfaces of the concrete in real time. When the temperature difference is too large, the PLC controller automatically adjusts the opening of the electromagnetic flow valve or controls the cooling water pump to increase the cooling water flow and rapidly reduce the internal temperature; conversely, it reduces the flow, achieving automated and precise temperature control and effectively preventing cracks. Furthermore, the cooling inner pipes are radially distributed, with the input end located in the central region of the concrete. Since the temperature is highest at the center of the large-volume concrete, low-temperature cooling water is directly introduced into the central region, utilizing the maximum temperature difference for heat exchange, and then flows outwards to conform to the internal temperature field distribution of the concrete, resulting in higher and more uniform heat dissipation efficiency. The wavy design of the cooling inner pipes increases the contact area between the pipes and the concrete, extends the water flow path, and further improves heat exchange efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the structure of the large-volume concrete temperature control device provided in the embodiment of this utility model; Figure 2 A schematic diagram of the temperature control device for large-volume concrete provided in this embodiment of the present invention during use.

[0016] The labels for the various figures are as follows: 1. Cooling water tank; 2. Cooling water pump; 3. Inner cooling pipe; 4. Outer cooling pipe; 5. Temperature measuring unit; 6. Electromagnetic flow valve; 7. PLC controller; 8. Concrete; 51. Internal temperature sensor; 52. External temperature sensor. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Please see Figures 1 to 2 This application provides a temperature control device for large-volume concrete 8, including a cooling water tank 1, a cooling water pump 2, an inner cooling pipe 3, an outer cooling pipe 4, a temperature measuring unit 5, an electromagnetic flow valve 6, and a PLC controller 7.

[0022] The cooling water tank 1 is used to store cooling water at a lower temperature (such as groundwater or water treated by a chiller). The input end of the cooling water pump 2 is connected to the cooling water tank 1 to provide circulation power.

[0023] The cooling structure consists of multiple internal cooling pipes 3. To specifically address the problem of severe heat accumulation at the center of the large-volume concrete 8, the internal cooling pipes 3 are radially distributed within the concrete 8 (e.g., ...). Figure 1 (As shown). Specifically, the input ends of the inner cooling pipes 3 converge and extend vertically from the central area of ​​the concrete 8 (or are led out through pipes), while the output ends extend beyond the boundary of the concrete 8. The outer cooling pipes 4 serve as the main water supply pipe, with one end connected to the output end of the cooling water pump 2 and the other end connected to the input ends of each inner cooling pipe 3.

[0024] To achieve intelligent control, the device is equipped with a temperature measuring unit 5 and a control actuator. The temperature measuring unit 5 includes multiple internal temperature sensors 51 embedded inside the concrete 8 and arranged close to each cooling inner pipe 3, as well as external temperature sensors 52 installed on the surface of the concrete 8 or in the air. Electromagnetic flow valves 6 are installed on the input end of each cooling inner pipe 3.

[0025] The PLC controller 7 (Programmable Logic Controller) is the core of the entire system. It is electrically connected to the internal temperature sensor 51, the external temperature sensor 52, the cooling water pump 2, and each electromagnetic flow valve 6 via wires.

[0026] The working principle is as follows: During the curing process of concrete 8, internal temperature sensor 51 collects temperature data at various points inside concrete 8 in real time, while external temperature sensor 52 collects ambient or surface temperature data and transmits the signals to PLC controller 7. PLC controller 7 calculates the temperature difference (ΔT) between the inside and outside. A temperature difference threshold (e.g., 20℃ or 25℃) is preset in the PLC.

[0027] When the monitored temperature difference ΔT exceeds the set threshold, the PLC controller 7 issues a command to increase the opening of the electromagnetic flow valve 6 and simultaneously increase the speed of the cooling water pump 2, thereby increasing the flow rate of low-temperature cooling water into the cooling inner pipe 3. The low-temperature water first enters the central area where heat is most concentrated, carrying away a large amount of heat, thus rapidly reducing the internal temperature and narrowing the temperature difference between the inside and the surface.

[0028] When the monitored temperature difference ΔT is lower than the set safety value, the PLC controller 7 reduces the opening of the electromagnetic flow valve 6, reduces the flow rate, prolongs the residence time of the cooling water in the pipe, fully exchanges heat, and saves pumping energy.

[0029] In addition, in order to increase the heat exchange area, such as Figure 1 As shown, the cooling inner pipe 3 is designed as a curved, wavy pipe (or an S-shaped bend). This structure significantly increases the heat exchange area per unit volume without increasing the difficulty of pouring concrete 8.

[0030] To conserve water resources, the output end of the cooling inner pipe 3 is connected to the cooling water tank 1 via a pipeline, forming a closed-loop circulation. Furthermore, a waste heat recovery device (such as a plate heat exchanger) is installed on the return water pipeline connecting the cooling inner pipe 3 and the cooling water tank 1. The high-temperature water exiting the concrete 8 passes through the waste heat recovery device, transferring heat to another source of domestic water. The cooled water then returns to the water tank for reuse, achieving secondary energy utilization.

[0031] To enhance safety, the system also includes an audible and visual alarm connected to the PLC controller 7. When the temperature rises abnormally and cannot be reduced to a safe range within a short time by adjusting the flow rate, or when a sensor malfunctions, the PLC controls the audible and visual alarm to sound an alarm, alerting construction personnel to intervene manually.

[0032] During construction and installation, the cooling inner pipe 3 is laid before pouring and fixed to the steel reinforcement skeleton inside the concrete 8 by steel wire to ensure that the pipe position does not shift during the pouring and vibration of the concrete 8.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A temperature control device for large-volume concrete, characterized in that, The temperature control device for large-volume concrete includes: A cooling water tank, wherein the cooling water tank is filled with cooling water; A cooling water pump, the input end of which is connected to the cooling water tank; Multiple cooling inner pipes are radially distributed inside the concrete. The input end of the cooling inner pipe extends from the central area of ​​the concrete, and the output end extends outward from inside the concrete. The cooling outer pipe has one end connected to the output end of the cooling water pump and the other end connected to the input end of the cooling inner pipe. The temperature measuring unit includes multiple internal temperature sensors located near each of the cooling inner tubes and external temperature sensors disposed outside the concrete. Multiple electromagnetic flow valves are provided at the input end of each of the cooling inner tubes; The PLC controller is electrically connected to the internal temperature sensor, external temperature sensor, cooling water pump, and electromagnetic flow valve via wires.

2. The temperature control device for large-volume concrete according to claim 1, characterized in that: The cooling inner pipe is a curved, wavy pipe.

3. The temperature control device for large-volume concrete according to claim 1, characterized in that: The output end of the inner cooling pipe is connected to the cooling water tank.

4. The temperature control device for large-volume concrete according to claim 3, characterized in that: A waste heat recovery device is installed on the pipe connecting the inner cooling pipe to the cooling water tank.

5. The temperature control device for large-volume concrete according to claim 1, characterized in that: It also includes an audible and visual alarm, which is electrically connected to the PLC controller.

6. The temperature control device for large-volume concrete according to claim 1, characterized in that: The cooling inner pipe is fixed to the steel reinforcement skeleton inside the concrete by being tied with steel wire.

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